EP0303635B1 - System with a hydraulic lifting generator for earth drilling - Google Patents

System with a hydraulic lifting generator for earth drilling Download PDF

Info

Publication number
EP0303635B1
EP0303635B1 EP88901267A EP88901267A EP0303635B1 EP 0303635 B1 EP0303635 B1 EP 0303635B1 EP 88901267 A EP88901267 A EP 88901267A EP 88901267 A EP88901267 A EP 88901267A EP 0303635 B1 EP0303635 B1 EP 0303635B1
Authority
EP
European Patent Office
Prior art keywords
impulse tube
valve
tube
impulse
drill pipe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88901267A
Other languages
German (de)
French (fr)
Other versions
EP0303635A1 (en
Inventor
Ivan Jaroslav Cyphelly
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Salzgitter Maschinenbau GmbH
Original Assignee
Salzgitter Maschinenbau GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Salzgitter Maschinenbau GmbH filed Critical Salzgitter Maschinenbau GmbH
Priority to AT88901267T priority Critical patent/ATE68036T1/en
Publication of EP0303635A1 publication Critical patent/EP0303635A1/en
Application granted granted Critical
Publication of EP0303635B1 publication Critical patent/EP0303635B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/06—Down-hole impacting means, e.g. hammers
    • E21B4/14—Fluid operated hammers

Definitions

  • the invention relates to a device with a stroke generator intended for earth drilling purposes, which can be actuated by a flushing liquid flow to be introduced into a borehole via a drill pipe, and in which an oscillating lifting force exerted on a drilling tool that can be attached to the stroke generator is generated by means of an oscillating force with the drill pipe in Connected, the liquid flow controlling, spring-loaded shock valve is generated.
  • the known devices of the type mentioned have various disadvantages which have hitherto impaired the problem-free use of the devices mentioned.
  • the inflowing rinsing liquid must have a high speed or a high pressure
  • the shock valve has a sealing fit in order to be able to ensure the pulse pressure required for the stroke movement of the tool.
  • such a sealing fit of the shock valve is susceptible to damage because the flushing liquid flow has a high proportion of dirt, unless it is filtered in a complex manner. If the fit of the shock valve is damaged, the known devices can only function with reduced efficiency or no longer at all.
  • the known devices have the disadvantage that the various parameters, namely the speed or the pressure of the flushing liquid flow, the passage opening of the shock valve, the spring force of the shock valve and possibly the force of a counter spring of the shock valve, etc., must be carefully coordinated in order to be able to maintain the operation of the facilities as intended.
  • the object of the invention is to avoid the mentioned disadvantages of the known devices and to create a device of the type mentioned which accepts an unfiltered flushing liquid as an energy carrier without functional disturbances, that is without fits and without sliding sealing points in the shock valve, and which the cycles in succession Closures and openings of the shock valve automatically guaranteed.
  • the device has the features that at the lower end of the drill pipe a pulse tube is movably mounted in the longitudinal direction, a current distribution choke being formed between the lower mouth of the drill pipe and the upper mouth of the pulse pipe, through which the axial position corresponds of the impulse tube is the ratio of the liquid flow flowing in the borehole to the outside of the impulse tube to that into the interior of the Impulse tube flowing liquid flow is controllable, and wherein the impulse tube is exposed to the force of a spring arrangement with respect to the drill string, which strives to urge the current distribution throttle in a in the borehole to the outside of the pulse tube flowing position reducing the liquid flow, further that the lower end of the Pulse tube is designed to receive a drilling tool and contains a shock valve exposed to the opening force of a threshold spring, which opens on the one hand inside the pulse tube and on the other hand in the borehole on the outside of the pulse tube, and that the axial length of the pulse tube is significantly greater than that of the shock valve.
  • a tubular drill string 2 is introduced into an indicated borehole 1, only the lower end of which is shown in FIG. 1.
  • a guide tube 3 is screwed to this lower end of the drill pipe 2, with which a further inner pipe 4 is screwed, which forms a lower mouth 5 of the drill pipe 2.
  • the guide tube 3 is provided with a total of four axially parallel guide lugs 6, which are distributed evenly over the circumference and which axially slide a coaxial pulse tube 7. If the drill string 2 is driven in rotation, the flags 6 engage in each case in a longitudinal groove 6 'of the pulse tube 7 to transmit the torque to the pulse tube 7.
  • the pulse tube 7 has an upper mouth 8, which is opposite the lower mouth 5 of the inner tube 4 and thus of the drill pipe 2 and forms a current distribution choke with it in the manner described below.
  • valve seat sleeve 10 is screwed, which contains a valve seat 11 at its lower end.
  • a valve body 12 of a shock valve generally designated 13 is guided through a cylindrical sleeve 14 with inner, cross-set flags 14 'in the pulse tube 7 and exposed to the force of a spring 15.
  • the spring 15 strives to lift the valve body 12 from the valve seat 11. It should be mentioned that the valve seat 11 and the valve body 12 do not form a snug fit in their closed position.
  • a drilling tool 16 is provided for deep hole hammer applications, which produces actual borehole 1.
  • the parts which are movable with respect to the drill pipe 2, namely the pulse tube 7, the valve seat sleeve 10 together with the valve body 12 and the spring 15 and the drilling tool 16, are lifted against the mouth 5 of the drill pipe 2 by a spring 18 supported on a support ring 17.
  • the support ring 17 rests on radial steps of the flags 6.
  • shock valve 13 is closed abruptly, and the aforementioned, axially relatively movable parts 7, 10, 12, 15 and 16 are thrown downward by the inertia of the downward moving liquid column contained in the impulse tube 7, since this "ram impact" Force of the return spring 18 exceeds many times.
  • the gap between the mouths 5 and 8 increases.
  • the frequency of these lifting movements is primarily determined by the speed of retraction of the moving parts 7, 10, 12, 15 and 16, that is to say by the force of the spring 18 in relation to the mass of the moving parts and the stroke. This retraction is usually a relatively slow process.
  • the rebound of the liquid contained in the impulse tube 7 can, however, be used to accelerate the aforementioned withdrawal by arranging a check valve 22, shown schematically and in broken lines, at the upper end of the impulse tube 7 in its mouth 8, which resets the rebound of the liquid column in the impulse tube 7 by closing picks up and thus supports the action of the spring 18. Since the check valve 22 remains closed for a very short time in the order of magnitude of a few milliseconds, relief, that is to say opening, of the shock valve 13 is not impaired by the closing of the check valve 22.
  • a pressure relief valve 23 shown schematically and in broken lines, can additionally be installed in the valve body 12 of the shock valve 13, which smears the pressure peak generated.
  • FIG. 2 an alternative embodiment of a guide and spring arrangement is shown in perspective, which replaces the sliding guide and the return of the valve body 12 of the shock valve 13 by the sleeve 14 shown in Fig. 1 and the spring 15.
  • the valve body 12 of the shock valve 13 of FIG. 1 is provided with an axial valve tappet 25, which has three radial arms 26 each arranged in a common plane at an axial distance. The arms 26 are always at a radial distance from the valve seat sleeve 10 (FIG. 1).
  • the present arrangement also contains three guide rods 27, which are fastened to the valve seat sleeve 10 (FIG.
  • valve body 12 is simultaneously guided centrally and biased axially upwards in the opening direction, without a sliding guide in the valve seat sleeve 10 (FIG. 1) and one of the springs 15 (Fig. 1) corresponding return spring would be necessary.

Abstract

PCT No. PCT/EP88/00085 Sec. 371 Date Oct. 24, 1988 Sec. 102(e) Date Oct. 24, 1988 PCT Filed Feb. 5, 1988 PCT Pub. No. WO88/06673 PCT Pub. Date Sep. 7, 1988.A drilling device for drilling a borehole and comprising a drilling tool, a drill pipe extending into the borehole for conducting a flow of liquid thereinto for generating an oscillating percussion force applied to the drilling tool, a longitudinally movable impulse tube located below a lower end of the drill tube, a throttle located between a lower mouth of the drill tube and an upper mouth of the impulse tube for controlling a ration of flow portion of the liquid outside and inside the impulse tube in accordance with longitudinal position thereof, and a spring-loaded thrust valve for controlling the flow of liquid inside the tube.

Description

Die Erfindung bezieht sich auf eine Einrichtung mit einem für Erdbohrzwecke vorgesehenen Hubgenerator, welcher durch einen in ein Bohrloch über ein Bohrgestänge einzuleitenden, spülenden Flüssigkeitsstrom betätigbar ist, und bei welchem eine auf ein am Hubgenerator anbringbares Bohrwerkzeug ausgeübte, oszillierende Hubkraft mittels eines mit dem Bohrgestänge in Verbindung stehenden, den Flüssigkeitsstrom steuernden, federbelasteten Stoßventils erzeugt ist.The invention relates to a device with a stroke generator intended for earth drilling purposes, which can be actuated by a flushing liquid flow to be introduced into a borehole via a drill pipe, and in which an oscillating lifting force exerted on a drilling tool that can be attached to the stroke generator is generated by means of an oscillating force with the drill pipe in Connected, the liquid flow controlling, spring-loaded shock valve is generated.

Einrichtungen dieser Art sind beispielsweise aus den USA-Patentschriften 2,388,741 und 3,018,834 sowie aus der britischen Patentschrift 2776 A.D. 1913 bekannt. Bei den bekannten Einrichtungen durchfließt der spülende Flüssigkeitsstrom das durch eine Federanordnung offen gehaltene Stoßventil mit großer Geschwindigkeit bzw. unter hohem Druck, um zu einem Bohrwerkzeug zu gelangen, das an einem Stößel oder Kolben des Stoßventils befestigt ist. Sobald die hydrodynamischen Kräfte des Flüssigkeitsstroms am Stoßventil größer als die Öffnungskraft der Feder des Stoßventils sind, schließt das letztere abrupt, so daß infolge der hohen Geschwindigkeit bzw. des hohen Drucks des durch das Bohrgestänge zugeführten spülenden Flüssigkeitsstroms ein Druckimpuls auf den Stößel oder den Kolben des Stoßventils erzeugt wird, der sich auf das Werkzeug als Hubbewegung überträgt. An sich wird durch diese Hubbewegung der Flüssigkeitsstrom teilweise entspannt, so daß die Feder des Stoßventils anschließend dieses wieder öffnet und der Huberzeugungsvorgang erneut beginnen kann.Devices of this type are known, for example, from US Pat. Nos. 2,388,741 and 3,018,834 and from British Pat. No. 2776 AD 1913. In the known devices, the flushing liquid flow flows through the shock valve, which is kept open by a spring arrangement, at high speed or under high pressure, in order to arrive at a drilling tool which is fastened to a tappet or piston of the shock valve. As soon as the hydrodynamic forces of the liquid flow on Shock valve are greater than the opening force of the spring of the shock valve, the latter closes abruptly, so that due to the high speed or the high pressure of the flushing liquid stream supplied through the drill pipe, a pressure pulse is generated on the tappet or the piston of the shock valve, which opens transmits the tool as a lifting movement. As such, the liquid flow is partially relaxed by this stroke movement, so that the spring of the shock valve then opens it again and the stroke generation process can begin again.

Die bekannten Einrichtungen der angeführten Art weisen verschiedene Nachteile auf, welche eine problemlose Anwendung der genannten Einrichtungen bisher beeinträchtigt haben. Abgesehen davon, daß bei den bekannten Einrichtungen die zuströmende Spülflüssigkeit eine große Geschwindigkeit bzw. einen hohen Druck aufweisen muß, ist es auch unabdingbar, daß das Stoßventil eine dichtende Passung aufweist, um den für die Hubbewegung des Werkzeugs erforderlichen Impulsdruck gewährleisten zu können. Eine solche dichtende Passung des Stoßventils ist aber beschädigungsanfällig, weil der spülende Flüssigkeitsstrom einen hohen Schmutzanteil aufweist, es sei denn, er werde in aufwendiger Weise gefiltert. Wenn die Passung des Stoßventils beschädigt ist, können die bekannten Einrichtungen nur noch mit herabgesetztem Wirkungsgrad oder überhaupt nicht mehr funktionieren.The known devices of the type mentioned have various disadvantages which have hitherto impaired the problem-free use of the devices mentioned. In addition to the fact that in the known devices the inflowing rinsing liquid must have a high speed or a high pressure, it is also essential that the shock valve has a sealing fit in order to be able to ensure the pulse pressure required for the stroke movement of the tool. However, such a sealing fit of the shock valve is susceptible to damage because the flushing liquid flow has a high proportion of dirt, unless it is filtered in a complex manner. If the fit of the shock valve is damaged, the known devices can only function with reduced efficiency or no longer at all.

Ein weiterer wesentlicher Nachteil der bekannten Einrichtungen besteht darin, daß die erneute Öffnung des Stoßventils nicht sichergestellt ist, weil für den Abbau des auf das Stoßventil wirkenden Flüssigkeitsdrucks nur die Hubbewegung des Stößels oder des Kolbens des Stoßenventils einen Einfluß hat. Bei ungünstigen Geschwindigkeits- bzw. Druckverhältnissen des spülenden Flüssigkeitsstroms und/oder bei einer ein Verklemmen des Stoßventils in seiner Passung bewirkenden Verschmutzung des Stoßventils kann es sich ergeben, daß die Öffnungskraft des Stoßventils nicht ausreichend groß ist, um dieses wieder zu öffnen, so daß die Einrichtung nicht mehr funktionsfähig wird.Another major disadvantage of the known devices is that the reopening of the shock valve is not ensured because only the stroke movement of the tappet or the piston of the to reduce the fluid pressure acting on the shock valve Impact valve has an influence. With unfavorable speed or pressure conditions of the flushing liquid flow and / or with a jamming of the shock valve in its fit causing contamination of the shock valve, the opening force of the shock valve may not be large enough to open it again, so that the Facility is no longer functional.

Schließlich haftet den bekannten Einrichtungen der Nachteil an, daß die verschiedenen Parameter, nämlich die Geschwindigteit bzw. der Druck des spülenden Flüssigkeitsstroms, die Durchlaßöffnung des Stoßventils, die Federkraft des Stoßventils und gegebenenfalls die Kraft einer Gegenfeder des Stoßventils usw., sorgfältig aufeinander abgestimmt werden müssen, um den Betrieb der Einrichtungen bestimmungsgemäß aufrechterhalten zu können.Finally, the known devices have the disadvantage that the various parameters, namely the speed or the pressure of the flushing liquid flow, the passage opening of the shock valve, the spring force of the shock valve and possibly the force of a counter spring of the shock valve, etc., must be carefully coordinated in order to be able to maintain the operation of the facilities as intended.

Aufgabe der Erfindung ist, die erwähnten Nachteile der bekannten Einrichtungen zu vermeiden und eine Einrichtung der eingangs genannten Art zu schaffen, welche als Energieträger eine ungefilterte Spülflüssigkeit ohne Funktionsstörungen annimmt, das heißt ohne Passungen und ohne gleitende Dichtstellen im Stoßventil auskommt, und welche die Zyklen aufeinanderfolgender Schließungen und Öffnungen des Stoßventils selbsttätig gewährleistet.The object of the invention is to avoid the mentioned disadvantages of the known devices and to create a device of the type mentioned which accepts an unfiltered flushing liquid as an energy carrier without functional disturbances, that is without fits and without sliding sealing points in the shock valve, and which the cycles in succession Closures and openings of the shock valve automatically guaranteed.

Zur Lösung dieser Aufgabe weist die erfindungsgemäße Einrichtung die Merkmale auf, daß am unteren Ende des Bohrgestänges ein Impulsrohr in Längsrichtung beweglich gelagert ist, wobei zwischen der unteren Mündung des Bohrgestänges und der oberen Mündung des Impulsrohrs eine Stromverteildrossel ausgebildet ist, durch welche entsprechend der axialen Lage des Impulsrohrs das Verhältnis des im Bohrloch auf die Außenseite des Impulsrohrs fließenden Flüssigkeitsstroms zu dem in das Innere des Impulsrohrs fließenden Flüssigkeitsstroms steuerbar ist, und wobei das Impulsrohr bezüglich des Bohrgestänges der Kraft einer Federanordnung ausgesetzt ist, welche bestrebt ist, die Stromverteildrossel in eine den im Bohrloch auf die Außenseite des Impulsrohrs fließenden den Flüssigkeitsstrom vermindernde Lage zu drängen, daß ferner das untere Ende des Impulsrohrs zur Aufnahme eines Bohrwerkzeugs ausgebildet ist und ein der Öffnungskraft einer Schwellenfeder ausgesetztes Stoßventil enthält, das einerseits im Innern des Impulsrohrs und and ererseits im Bohrloch an der Außenseite des Impulsrohrs mündet, und daß die axiale Länge des Impulsrohrs wesentlich größer als diejenige des Stoßventils ist.To achieve this object, the device according to the invention has the features that at the lower end of the drill pipe a pulse tube is movably mounted in the longitudinal direction, a current distribution choke being formed between the lower mouth of the drill pipe and the upper mouth of the pulse pipe, through which the axial position corresponds of the impulse tube is the ratio of the liquid flow flowing in the borehole to the outside of the impulse tube to that into the interior of the Impulse tube flowing liquid flow is controllable, and wherein the impulse tube is exposed to the force of a spring arrangement with respect to the drill string, which strives to urge the current distribution throttle in a in the borehole to the outside of the pulse tube flowing position reducing the liquid flow, further that the lower end of the Pulse tube is designed to receive a drilling tool and contains a shock valve exposed to the opening force of a threshold spring, which opens on the one hand inside the pulse tube and on the other hand in the borehole on the outside of the pulse tube, and that the axial length of the pulse tube is significantly greater than that of the shock valve.

Da bei der erfindungsgemäßen Einrichtung in Übereinstimmung mit einem bekannten sogenannten "hydraulischen Widder" nur die Trägheitskräfte einer Flüssigkeitssäule, nämlich derjenigen des Impulsrohrs, zur Anwendung gelangen, und da die Funktion des stromunterbrechenden Stoßventils von derjenigen der Werkzeugbetätigung getrennt ist, können jegliche gleitende Dichtteile und Passungen entfallen. Zudem ist das Öffnen des Stoßventils nach erfolgter Hubbewegung über die Stromverteildrossel sichergestellt. Bei entsprechender Ausbildung der Führungselemente des Stoßventils mit Hilfe von Federelementen können sogar Gleitführungen vermieden bzw. eliminiert werden.Since only the inertial forces of a liquid column, namely that of the impulse tube, are used in the device according to the invention in accordance with a known so-called "hydraulic ram", and since the function of the current-interrupting shock valve is separated from that of the tool actuation, any sliding sealing parts and fits can be used omitted. In addition, the opening of the shock valve after the stroke movement is ensured via the power distribution choke. With appropriate design of the guide elements of the shock valve with the aid of spring elements, sliding guides can even be avoided or eliminated.

Ausführungsbeispiele des Erfindungsgegenstands werden nachstehend anhand der Zeichnungen erläutert. Es zeigen

  • Fig. 1 einen Schnitt durch die Achse einer als Tiefbohrhammer ausgebildeten Einrichtung gemäß der Erfindung, und
  • Fig. 2 eine perspektivische Ansicht einer alternativen Führungsvorrichtung für einen Ventilkörper des Stoßventils der Fig. 1 mittels Federelementen.
Exemplary embodiments of the subject matter of the invention are explained below with reference to the drawings. Show it
  • Fig. 1 shows a section through the axis of a device designed as a deep drilling hammer according to the invention, and
  • Fig. 2 is a perspective view of an alternative guide device for a valve body of the shock valve of Fig. 1 by means of spring elements.

Gemäß Fig. 1 ist in ein angedeutetes Bohrloch 1 ein rohrförmiges Bohrgestänge 2 eingebracht, von welchem in Fig. 1 nur dessen unteres Ende dargestellt ist. Mit diesem unteren Ende des Bohrgestänges 2 ist ein Führungsrohr 3 verschraubt, mit welchem ein weiteres, inneres Rohr 4 verschraubt ist, das eine untere Mündung 5 des Bohrgestänges 2 bildet. Das Führungsrohr 3 ist mit insgesamt vier gleichmäßig über den Umfang verteilten, achsparallelen Führungsfahnen 6 versehen, welche ein koaxiales Impulsrohr 7 axial gleitend führen. Falls das Bohrgestänge 2 drehend angetrieben ist, greifen die Fahnen 6 innen jeweils in eine Längsnut 6′ des Impulsrohrs 7, um das Drehmoment auf das Impulsrohr 7 zu übertragen. Das Impulsrohr 7 weist eine obere Mündung 8 auf, welche der unteren Mündung 5 des inneren Rohrs 4 und damit des Bohrgestänges 2 gegenüberliegt und mit dieser in der nachfolgend beschriebenen Weise eine Stromverteildrossel bildet.According to FIG. 1, a tubular drill string 2 is introduced into an indicated borehole 1, only the lower end of which is shown in FIG. 1. A guide tube 3 is screwed to this lower end of the drill pipe 2, with which a further inner pipe 4 is screwed, which forms a lower mouth 5 of the drill pipe 2. The guide tube 3 is provided with a total of four axially parallel guide lugs 6, which are distributed evenly over the circumference and which axially slide a coaxial pulse tube 7. If the drill string 2 is driven in rotation, the flags 6 engage in each case in a longitudinal groove 6 'of the pulse tube 7 to transmit the torque to the pulse tube 7. The pulse tube 7 has an upper mouth 8, which is opposite the lower mouth 5 of the inner tube 4 and thus of the drill pipe 2 and forms a current distribution choke with it in the manner described below.

Am unteren Ende des Impulsrohrs 7, dessen Länge gemäß den Bruchlinien 9 wesentlich größer ist als dies aus der zeichnerischen Darstellung hervorgeht, ist als Bestandteil des Impulsrohrs 7 eine Ventilsitzhülse 10 angeschraubt, die an ihrem unteren Ende einen Ventilsitz 11 enthält. Ein Ventilkörper 12 eines insgesamt mit 13 bezeichneten Stoßventils ist durch eine zylindrische Hülse 14 mit inneren, über Kreuz gesetzten Fahnen 14′ im Impulsrohr 7 geführt und der Kraft einer Feder 15 ausgesetzt. Die Feder 15 ist bestrebt, den Ventilkörper 12 vom Ventilsitz 11 abzuheben. Zu erwähnen ist, daß der Ventilsitz 11 und der Ventilkörper 12 in ihrer Schließlage keinen Paßsitz bilden.At the lower end of the pulse tube 7, the length of which, according to the break lines 9, is substantially greater than that shown in the drawing, as part of the pulse tube 7, a valve seat sleeve 10 is screwed, which contains a valve seat 11 at its lower end. A valve body 12 of a shock valve generally designated 13 is guided through a cylindrical sleeve 14 with inner, cross-set flags 14 'in the pulse tube 7 and exposed to the force of a spring 15. The spring 15 strives to lift the valve body 12 from the valve seat 11. It should be mentioned that the valve seat 11 and the valve body 12 do not form a snug fit in their closed position.

Am unteren Ende der Ventilsitzhülse 10 und damit des Impulsrohrs 7 ist ein für Tieflochhammer-Anwendungen vorgesehenes Bohrwerkzeug 16 befestigt, das das eigentliche Bohrloch 1 herstellt. Die bezüglich des Bohrgestänges 2 beweglichen Teile, nämlich das Impulsrohr 7, die Ventilsitzhülse 10 samt dem Ventilkörper 12 und der Feder 15 und das Bohrwerkzeug 16, werden durch eine auf einem Stützring 17 abgestützte Feder 18 gegen die Mündung 5 des Bohrgestänges 2 gehoben. Der Stützring 17 ruht auf radialen Stufen der Fahnen 6.At the lower end of the valve seat sleeve 10 and thus the pulse tube 7, a drilling tool 16 is provided for deep hole hammer applications, which produces actual borehole 1. The parts which are movable with respect to the drill pipe 2, namely the pulse tube 7, the valve seat sleeve 10 together with the valve body 12 and the spring 15 and the drilling tool 16, are lifted against the mouth 5 of the drill pipe 2 by a spring 18 supported on a support ring 17. The support ring 17 rests on radial steps of the flags 6.

Zur Beschreibung der Funktionsweise der dargestellten Einrichtung wird eine Ausgangssituation angenommen, in welcher das Stoßventil 13 offen ist und das Impulsrohr 7 durch die Kraft der Feder 18 aufwärts bewegt wird, wobei aus dem Bohrgestänge 2 gemäß dem Pfeil 19 Spülflüssigkeit ausströmt. Solange der Spalt zwischen der Mündung 5 des Bohrgestänges 2 und der-oberen Mündung 8 des Impulsrohrs 7 groß ist, fließt aus Widerstandsgründen ein Großteil des Spülstroms gemäß dem Pfeil 20 zwischen dem Führungsrohr 3 und dem Impulsrohr 7 in das Bohrloch 1 ab. Beim Fortschreiten der Schließbewegung nimmt jedoch der gemäß Pfeil 21 in das Impulsrohr 7 gezwängte Spülstrom zu, bis die durch die steigende Umspülungsgeschwindigkeit verursachte Druckabfallkraft am offenen Stoßventil 13 die Schwellenkraft der Feder 15 des Stoßventils 13 übersteigt. Dann wird das Stoßventil 13 schlagartig geschlossen, und es werden die vorerwähnten, axial relativ beweglichen Teile 7, 10, 12, 15 und 16 durch die Trägheit der sich abwärts bewegenden, im Impulsrohr 7 enthaltenen Flüssigkeitssäule nach unten geschleudert, da dieser "Widderstoß" die Kraft der rückholenden Feder 18 um ein Vielfaches übersteigt. Dabei vergrößert sich der Spalt zwischen den Mündungen 5 und 8.To describe the functioning of the device shown, an initial situation is assumed in which the shock valve 13 is open and the pulse tube 7 is moved upwards by the force of the spring 18, flushing liquid flowing out of the drill pipe 2 according to the arrow 19. As long as the gap between the mouth 5 of the drill pipe 2 and the upper mouth 8 of the impulse tube 7 is large, a large part of the flushing flow according to the arrow 20 flows between the guide tube 3 and the impulse tube 7 into the borehole 1 for reasons of resistance. As the closing movement progresses, however, the flushing current forced into the pulse tube 7 according to arrow 21 increases until the pressure drop force at the open shock valve 13 caused by the increasing flushing speed exceeds the threshold force of the spring 15 of the shock valve 13. Then the shock valve 13 is closed abruptly, and the aforementioned, axially relatively movable parts 7, 10, 12, 15 and 16 are thrown downward by the inertia of the downward moving liquid column contained in the impulse tube 7, since this "ram impact" Force of the return spring 18 exceeds many times. The gap between the mouths 5 and 8 increases.

Nach dem Aufprall des Bohrwerkzeugs 16 auf die Sohle des Bohrlochs 1 entspannt sich die Flüssigkeitssäule im Impulsrohr 7. Die Flüssigkeit schwingt in den Impulsrohr 7 in Richtung des Pfeils 20 durch den Spalt zwischen den Mündungen 5 und 8 zurück. Dadurch kann die Feder 15 das Stoßventil 13 öffnen, und die Feder 18 zieht die axial relativ beweglichen Teile 7, 10, 12, 15 und 16 wieder gegen die Mündung 5 des Bohrgestänges 2 zurück, was einen neuen, gleichartigen Zyklus einleitet.After the impact of the drilling tool 16 on the bottom of the borehole 1, the liquid column in the impulse tube 7 relaxes. The liquid swings in the impulse tube 7 in the direction of arrow 20 through the gap between the Muzzles 5 and 8 back. This allows the spring 15 to open the shock valve 13, and the spring 18 pulls the axially relatively movable parts 7, 10, 12, 15 and 16 back against the mouth 5 of the drill pipe 2, which initiates a new, similar cycle.

Die Frequenz dieser Hubbewegungen wird vornehmlich durch die Geschwindigkeit des Rückzugs der beweglichen Teile 7, 10, 12, 15 und 16, also durch die Kraft der Feder 18 im Verhältnis zur Masse der bewegten Teile und zum Hub, bestimmt. Diese Rückzugbewegung ist normalerweise ein verhältnismäßig langsamer Vorgang. Der Rückprall der im Impulsrohr 7 enthaltenen Flüssigkeit kann jedoch dadurch zur Beschleunigung des genannten Rückzugs ausgenutzt werden, daß am oberen Ende des Impulsrohrs 7 in dessen Mündung 8 ein schematisch und gestrichelt dargestelltes Rückschlagventil 22 angeordnet wird, das den Rückprall der Flüssigkeitssäule im Impulsrohr 7 durch Schließen aufnimmt und somit die Wirkung der Feder 18 unterstützt. Da das Rückschlagventil 22 nur ganz kurze Zeit in der Größenordnung von einigen Millisekunden geschlossen bleibt, ist eine Entlastung, das heißt Öffnung, des Stoßventils 13 durch das Schließen des Rückschlagventils 22 nicht beeinträchtigt.The frequency of these lifting movements is primarily determined by the speed of retraction of the moving parts 7, 10, 12, 15 and 16, that is to say by the force of the spring 18 in relation to the mass of the moving parts and the stroke. This retraction is usually a relatively slow process. The rebound of the liquid contained in the impulse tube 7 can, however, be used to accelerate the aforementioned withdrawal by arranging a check valve 22, shown schematically and in broken lines, at the upper end of the impulse tube 7 in its mouth 8, which resets the rebound of the liquid column in the impulse tube 7 by closing picks up and thus supports the action of the spring 18. Since the check valve 22 remains closed for a very short time in the order of magnitude of a few milliseconds, relief, that is to say opening, of the shock valve 13 is not impaired by the closing of the check valve 22.

Bei großen Hüben beginnt sich die Zeitdifferenz zwischen dem beschriebenen "Widderstoß" der im Impulsrohr 7 enthaltenen Flüssigkeitssäule und dem Aufprall des Bohrwerkzeugs 16 auf die Sohle des Bohrlochs 1 bemerkbar zu machen, was zu einem "Doppelstoß" führt, da die Druckwelle im Impulsrohr 7 schnell abklingt. Um diese uner wünschte Erscheinung zu vermeiden, kann zusätzlich im Ventilkörper 12 des Stoßventils 13 ein schematisch und gestrichelt dargestelltes Überdruckventil 23 eingebaut werden, welches die erzeugte Druckspitze verschmiert.With large strokes, the time difference between the described "ram impact" of the liquid column contained in the impulse tube 7 and the impact of the drilling tool 16 on the base of the borehole 1 begins to be noticed, which leads to a "double impact", since the pressure wave in the impulse tube 7 is rapid subsides. In order to avoid this undesirable phenomenon, a pressure relief valve 23, shown schematically and in broken lines, can additionally be installed in the valve body 12 of the shock valve 13, which smears the pressure peak generated.

In Fig. 2 ist eine alternative Ausführungsform einer Führungs- und Federanordnung perspektivisch dargestellt, welche die Gleitführung und die Rückführung des Ventilkörpers 12 des Stoßventils 13 durch die in Fig. 1 dargestellte Hülse 14 sowie die Feder 15 ersetzt. Wie aus Fig. 2 hervorgeht, ist bei dieser Ausführungsvariante der Ventilkörper 12 des Stoßventils 13 der Fig. 1 mit einem axialen Ventilstößel 25 versehen, der in axialem Abstand je drei in einer gemeinsamen Ebene angeordnete, radiale Arme 26 aufweist. Die Arme 26 befinden sich stets in einem radialen Abstand von der Ventilsitzhülse 10 (Fig. 1). Die vorliegende Anordnung enthält zudem drei Führungsstäbe 27, welche in nicht dargestellter Weise, beispielsweise mittels Schrauben, innen an der Ventilsitzhülse 10 (Fig. 1) befestigt sind, und deren obere und untere Enden etwas oberhalb der axialen Enden der Arme 26 des Ventilstößels 25 liegen. Hierbei sind zwischen den drei Führungsstäben 27 drei Distanzsegmente 28 eingebaut, um den Zusammenbau der dargestellten Anordnung zu ermöglichen. Sowohl im oberen als auch im unteren Bereich des Ventilstößels 25 und der Führungsstäbe 27 ist jeweils ein Ende eines Arms 26 des Ventilstößels 25 mit einem Ende eines Führungsstabs 27 durch eine ringstückförmige Blattfeder 29 (oben) bzw. 30 (unten) verbunden. Die Verbindungen können beispielsweise durch Niete 31 erfolgen oder aber auch durch jeweilige Schweißstellen realisiert werden. Durch diese Blattfedern 29 und 30, die jeweils in der Seitenansicht S-förmig verlaufen, wird der Ventilkörper 12 zugleich zentrisch geführt und axial nach oben hin in Öffnungsrichtung vorgespannt, ohne daß eine Gleitführung in der Ventilsitzhülse 10 (Fig. 1) und eine der Feder 15 (Fig. 1) entsprechende Rückführfeder nötig wären.In Fig. 2, an alternative embodiment of a guide and spring arrangement is shown in perspective, which replaces the sliding guide and the return of the valve body 12 of the shock valve 13 by the sleeve 14 shown in Fig. 1 and the spring 15. As can be seen from FIG. 2, in this embodiment variant, the valve body 12 of the shock valve 13 of FIG. 1 is provided with an axial valve tappet 25, which has three radial arms 26 each arranged in a common plane at an axial distance. The arms 26 are always at a radial distance from the valve seat sleeve 10 (FIG. 1). The present arrangement also contains three guide rods 27, which are fastened to the valve seat sleeve 10 (FIG. 1) in a manner not shown, for example by means of screws, and whose upper and lower ends lie somewhat above the axial ends of the arms 26 of the valve tappet 25 . Here, three spacer segments 28 are installed between the three guide rods 27 in order to enable the assembly shown to be assembled. Both in the upper and in the lower region of the valve tappet 25 and the guide rods 27, one end of an arm 26 of the valve tappet 25 is connected to one end of a guide rod 27 by means of an annular leaf spring 29 (top) and 30 (bottom). The connections can be made, for example, by rivets 31 or can also be realized by respective welding points. Through these leaf springs 29 and 30, each of which is S-shaped in the side view, the valve body 12 is simultaneously guided centrally and biased axially upwards in the opening direction, without a sliding guide in the valve seat sleeve 10 (FIG. 1) and one of the springs 15 (Fig. 1) corresponding return spring would be necessary.

Da bei der vorliegenden Einrichtung für den Ventilsitz 11 und den Ventilkörper 12 des Stoßventils keine Passung vorgesehen werden muß, ist ein störungsfreier Betrieb der Einrichtung sowohl bezüglich der Schließbewegung des Stoßventils 13 als auch bezüglich dessen Öffnungsbewegung auch dann gewährleistet, wenn der spülende Flüssigkeitsstrom einen sehr hohen Schmutzgehalt aufweist. Da zudem das bestimmungsgemäße Funktionieren der vorliegenden Einrichtung im wesentlichen nur von der im Impulsrohr 7 enthaltenen Flüssigkeitssäule abhängt, müssen auch keine Vorkehrungen getroffen werden, um dem spülenden Flüssigkeitsstrom eine bestimmte Geschwindigkeit bzw. einen bestimmten Druck zu verleihen. Schließlich setzt sich die vorliegende Einrichtung aus verhältnismäßig wenigen und einfachen Bauteilen zusammen, so daß ihre Störanfälligkeit äußerst gering ist.Since no fit has to be provided for the valve seat 11 and the valve body 12 of the shock valve in the present device, trouble-free operation of the device is ensured both with respect to the closing movement of the shock valve 13 and with respect to its opening movement even when the flushing liquid flow is very high Has dirt content. In addition, since the intended operation of the present device essentially depends only on the liquid column contained in the impulse tube 7, no precautions need to be taken to give the flushing liquid flow a certain speed or a certain pressure. Finally, the present device is composed of relatively few and simple components, so that its susceptibility to failure is extremely low.

Claims (10)

1. A device with a lifting generator provided for earth drilling purposes, said generator arranged to be actuated by a stream of flushing liquid introduced into a borehole (1) through a drill pipe (2), and by means of which an oscillating percussive force exerted on a drilling tool (16) attachable to the lifting generator is produced by means of a spring-loaded thrust valve (13) which is in contact with the drill pipe (2) and which controls the flow of liquid, characterised in that an impulse tube (7) movable in a longitudinal direction is mounted at the lower end (5) of the drill pipe (2), wherein a flow distributing throttle is provided between a lower mouth (5) of the drill pipe (2) and an upper mouth (8) of the impulse tube (7) by means of which, according to the axial position of the impulse tube (7), the ratio of the stream of liquid (20) flowing in the borehole (1) outside the impulse tube (7) to the stream of liquid (21) flowing in the impulse tube (7) is controllable, and wherein the impulse tube (7) is exposed to the force of a spring arrangement (18) relative to the drill pipe (2), the said spring arrangement acting to push the flow distribution throttle into a position which reduces the stream of liquid (20) flowing in the borehole (1) externally of the impulse tube (7), and further in that the lower end of the impulse tube (7) is designed to receive the drilling tool (16) and contains thrust valve (13) which is exposed to the opening force of at least one spring (15; 29, 30), the said thrust valve ending on the one hand in the interior of the impulse tube (7) and on the other hand in the borehole (1) outside the impulse tube (7), and in that the axial length of the impulse tube (7) is substantially greater than the axial length of the thrust valve (13).
2. A device according to Claim 1, characterised in that the upper mouth (8) of the impulse tube (7) is disposed axially opposite the lower mouth (5) of the drill pipe (2) and in that the edges of the two mouths (5, 8) constitute a variable throttle for the stream of liquid (20) flowing in the borehole (1) externally of the impulse tube (7).
3. A device according to Claim 1 or 2, characterised in that the impulse tube (7) is mounted in a guide tube (3) which is fixed to the drill pipe (2) and which is provided with guide splines (6).
4. A device according to one of Claims 1 to 3, characterised in that a valve seat (11) and a valve member (12) of the thrust valve (13) are constructed without a snug fit.
5. A device according to one of Claims 1 to 4, characterised in that at least one spring means (15) of the thrust valve (13) is arranged on the pressure side and radially outwardly within the liquid flow (21) in the impulse tube (7).
6. A device according to one of Claims 1 to 5, characterised in that a valve member (12) of the thrust valve (13) is guided by the springs (29, 30) without sliding guide means.
7. A device according to Claim 6, characterised in that each spring means comprises a leaf spring (29, 30), which has one end fixedly connected to an arm (26) of a valve stem (25) and which has its other end fixedly connected to one axial end of a guide rod (27), and in which the guide rods (27) are secured to the inside of the impulse tube (7).
8. A device according to Claim 7, charactarised in that two groups containing a plurality of said arms (26) and springs (29, 30) are each arranged at two axially spaced regions of the valve member (12), and in which each guide rod (27) extends between these said regions.
9. A device according to one of Claims 1 to 8, characterised in that a non-return valve (22) is provided at the upper end of the impulse tube (7) in its mouth (8) in order to increase the force of spring arrangement (18) acting on the impulse tube (7) in relation to the drill pipe (2) by utilising the recoil of the liquid column within the impulse tube (7) which is created upon the closing of the thrust valve (13).
10. A device according to one of Claims 1 to 9, characterised in that a pressure relief valve (23) is provided in the thrust valve (13) and which ends in the borehole (1) externally of the impulse tube (7), in order to limit the pressure shock which occurs upon closing of the thrust valve (13).
EP88901267A 1987-02-25 1988-02-05 System with a hydraulic lifting generator for earth drilling Expired - Lifetime EP0303635B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88901267T ATE68036T1 (en) 1987-02-25 1988-02-05 EQUIPMENT WITH A LIFTING HYDRAULIC GENERATOR DESIGNED FOR EARTH DRILLING PURPOSES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH70787 1987-02-25
CH707/87 1987-02-25

Publications (2)

Publication Number Publication Date
EP0303635A1 EP0303635A1 (en) 1989-02-22
EP0303635B1 true EP0303635B1 (en) 1991-10-02

Family

ID=4193295

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88901267A Expired - Lifetime EP0303635B1 (en) 1987-02-25 1988-02-05 System with a hydraulic lifting generator for earth drilling

Country Status (10)

Country Link
US (1) US4958690A (en)
EP (1) EP0303635B1 (en)
JP (1) JPH01502919A (en)
CN (1) CN1013785B (en)
AT (1) ATE68036T1 (en)
AU (1) AU597152B2 (en)
DE (1) DE3865272D1 (en)
OA (1) OA08920A (en)
WO (1) WO1988006673A1 (en)
ZA (1) ZA881272B (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5156223A (en) * 1989-06-16 1992-10-20 Hipp James E Fluid operated vibratory jar with rotating bit
AU662063B2 (en) * 1992-07-17 1995-08-17 Smith International, Inc. Air percussion hammer for directional drilling operations
US7011156B2 (en) * 2003-02-19 2006-03-14 Ashmin, Lc Percussion tool and method
US7555854B2 (en) * 2006-11-30 2009-07-07 Mlt Soil Co., Ltd. Earth auger head and excavation method
WO2008147015A1 (en) * 2007-05-28 2008-12-04 Daewon Electric Company Limited Extendable excavating screw with hydraulic excavating blades
GB2489628B (en) * 2008-06-13 2013-02-13 Schlumberger Holdings Wellbore instruments using magnetic motion converters
NO334793B1 (en) * 2011-08-19 2014-05-26 Pen Rock As High frequency liquid driven drill hammer for percussion drilling in hard formations
CN104295228B (en) * 2013-07-16 2016-07-06 中国石油化工股份有限公司 The reciprocating drilling well impacter of pressure reduction and method
CN104453761B (en) * 2013-09-25 2017-09-29 中国石油化工股份有限公司 The reciprocating well cementation vibrator of pressure difference and method
CN107420032B (en) * 2017-05-11 2023-07-21 能诚集团有限公司 Impact drilling tool and impact drilling machine with same
CN107762401B (en) * 2017-10-23 2019-06-04 中石化石油机械股份有限公司研究院 Rectangular wave waterpower pulse work string tripping in tool
CN108661551B (en) * 2018-08-02 2023-07-28 西南石油大学 Torsional vibration tool based on impeller and spring
CN112091920B (en) * 2020-09-18 2022-10-11 华智源电气集团股份有限公司 Transformer box body punching and fixing auxiliary device

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE267038C (en) * 1912-07-01 1913-11-10 Louis Jean Chretien Van Es
US2388741A (en) * 1944-04-29 1945-11-13 Russell R Hays Hydraulic drilling device
US3018834A (en) * 1959-12-09 1962-01-30 Socony Mobil Oil Co Inc Fluid-actuated percussion drill
US3387671A (en) * 1965-10-15 1968-06-11 Mission Mfg Co Percussion tool
US3416613A (en) * 1966-04-14 1968-12-17 Homer I. Henderson Combined rotary and percussion drill utilizing liquid drilling fluid
US3379261A (en) * 1966-05-23 1968-04-23 Leo A. Martini Percussion tool
US3570611A (en) * 1968-02-09 1971-03-16 Trustul Deforaj Pitesti Device for freeing seized drill strings
FI60151C (en) * 1979-06-26 1981-12-10 Tampella Oy Ab HYDRAULISK SLAGANORDNING
AU2863284A (en) * 1984-05-02 1985-11-28 Boniface Andre Auguste Perfectionnement aux marteaux fond-de-trou pour forage des sols
SE444127B (en) * 1984-06-25 1986-03-24 Atlas Copco Ab PRESSURE WASHING DRIVE SINGLE DRILLING MACHINE

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
GB A 2776 A.D. 1913 *

Also Published As

Publication number Publication date
JPH01502919A (en) 1989-10-05
US4958690A (en) 1990-09-25
OA08920A (en) 1989-10-31
DE3865272D1 (en) 1991-11-07
AU1229988A (en) 1988-09-26
CN88100959A (en) 1988-09-14
WO1988006673A1 (en) 1988-09-07
ZA881272B (en) 1988-08-23
EP0303635A1 (en) 1989-02-22
ATE68036T1 (en) 1991-10-15
CN1013785B (en) 1991-09-04
AU597152B2 (en) 1990-05-24

Similar Documents

Publication Publication Date Title
EP0303635B1 (en) System with a hydraulic lifting generator for earth drilling
DE3606515C2 (en)
DE1803417C3 (en) Pulling and pushing device for railroad cars
DE4227065C2 (en) Hydropneumatic hammer
DE3147399A1 (en) PRESSURE CONTROL DEVICE, IN PARTICULAR HYDRAULIC BEATER
DE2400925A1 (en) IMPACT DEVICE
DE1287867B (en)
DE2705191A1 (en) IMPACT DRILLING TOOL
CH636407A5 (en) VALVE CONTROL FOR RAMM DRILLING DEVICES.
DE2512731A1 (en) HYDRAULIC IMPACT DEVICE
DE2701195A1 (en) DRILL HOLE ROCKING DEVICE
DE937763C (en) Fluid operated shock drive, especially for earth drills
DE2461633C2 (en) Hydraulic impact device
DE2137385A1 (en) Rock drill
DE10319390B4 (en) Hydraulic shock absorber
DE2721705A1 (en) PRESSURE BALANCED VALVE WITH PRESSURE SENSOR DEVICE
DE2223292B2 (en) HYDRAULICALLY OPERATED IMPACT DEVICE
DE19810882A1 (en) Automatic conical half-collet assembly device for valve
DE2514392A1 (en) DRIVE TOOL, IN PARTICULAR FOR DRIVING AN OBJECT INTO THE GROUND
DE60130483T2 (en) ADJUSTABLE STABILIZER FOR DIRECTION DRILLING
DE4026959A1 (en) Electrically driven unit with thrust rod - moves in cylindrical pipe with spindle, cover, hole and piston
DE2854953C2 (en) Hammer drill
DE1533672C (en) Motor-driven demolition hammer
DE2053336B2 (en) Motor that can be driven by means of an elastic pressure medium
DE3129480C1 (en) Valve body for a hydraulic guillotine shear

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

17P Request for examination filed

Effective date: 19890210

17Q First examination report despatched

Effective date: 19900521

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 19911002

Ref country code: BE

Effective date: 19911002

Ref country code: SE

Effective date: 19911002

Ref country code: NL

Effective date: 19911002

REF Corresponds to:

Ref document number: 68036

Country of ref document: AT

Date of ref document: 19911015

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3865272

Country of ref document: DE

Date of ref document: 19911107

ET Fr: translation filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19920205

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19920229

Ref country code: CH

Effective date: 19920229

Ref country code: LI

Effective date: 19920229

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732E

REG Reference to a national code

Ref country code: FR

Ref legal event code: CD

Ref country code: FR

Ref legal event code: TP

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19940908

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19950126

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19950324

Year of fee payment: 8

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732E

REG Reference to a national code

Ref country code: FR

Ref legal event code: TP

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19951101

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19960205

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19960205

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19961031

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST